Burner



J. w. B.BALFOUR.

BURNER-,

APPLICATION FILED MAY 4, I920.

Patented Sept. 5, 1922.

22% W a? fiwp M w/Mm ATTY.

Patented Sept. 5, 1922.

JOHN WILLIAM BLACKBURN nenroun, ornonnon, ENGLAND.

BURNER.

Application fi led. Mayne, 1920. Serial No. 378,719.

To aZZ whom it may concern:

Be it known that I, JOHN WILLIAM BLACKBURN BALroUn, subject of the Iiing of Great Britain and Ireland, residing at .6 Palmerston Mansions, Queens Club Gardens, London, W. England, have invented new and useful Improvements in Burners, of which the following is a specification.

This invention relates to improvements in burners of the kind used in connection with industrial furnaces, land or marine boilers and the like for burning pulverulent or liquid fuel.

In modern firing methods as applied to such furnaces as mentioned both pulverized coal and liquid fuel are becoming largely used and it sometimes becomes desirable to change from one kind of fuel to the other, from powdered coal to oil or vice versa in the same furnace. Such change, however, generally necessitates a complicated and costly firing plant with double sets of burners for coal and for oil.

The object of the present invention is the construction of a burner suitable for use with either pulverized solid fuel or liquid fuel and which is capable of producing a high degree of heat combined with perfect combustion with either type of fuel.

According to this invention, the burner consists of two cylindrical bodies placed one inside the other made from suitable material such as mild steel and attached to a common end plate closing one end of'said cylinders. At the other end the cylinders are closed by means of funnel-shaped caps placed one inside the other; the outside one terminating in a suitable nozzle. The inner one of said cylinders is divided transversely into two compartments in which the fuel is heated and mixed with air and subsequently with steam on issuing from the inner into the outer funnel. The resultant mixture is forced through the nozzle and ignited.

The invention will be fully described with reference to the accompanying drawing which is a sectional elevation of the improved burner.

In the drawing, the burner consists of a cylinder 1 placed inside a second cylinder 2 attached to a common end plate 3 adapted to close one end of said cylinders. The opposite end of cylinder 1 is provided with a funnel-shaped cap 4 made integral with a plate 5 secured between the flanges of the the two cylinders.

outside cylinder 2 and the funnel-shaped cap e forming the end cover for'said cylinder 2 as shown in the drawing. The cylinder 1 is divided transversely into two hompartments bymeans' of the partition plate '7. In the first offsaid compartments is placed a coiled pipe 8 having its one end taken'through the end plate 3 and its other end terminating in the second compartment. A second pipe 9 enters the said first oompartment through the centre of plate 3 and is extended throughout the compartment,

and terminates in the second compartment. A. third pipe. 10 is also taken through the end plate terminating inside said plate n first compartment. A fourth pipe 11 is provided in the outer cylinder 2 and communicates with the space formed between ment is provided with a number of baffle plates 12 formed with transverse slits arranged in staggered formation as shown in the drawing.

The pipes 8 and 9 are the fuel supplv p pes, pipe 8 intended for liquid fuel and pipe 9 for powdered coal.

In operation, preheated air is injected into the first compartment through the pipe 10 and steam is injected into the space be tween the two cylinders by which means the inner cylinder 1 and the pipes therein become thoroughly heated. The fuel is now forced through either pipe 8 or pine 9, according to which type of fuel is for t e moment being used, into the second compartment where itmeets the preheated air issuing from the first compartment through an aperture 13 in the partition plate. The fuel and air in passing the baffle plates 12 become intimately mixed and the mixture on issuing from the cap at is met by and mixed with steam from pipe 11; the plate 5. being perforated so as to allow passage for the steam. The final mixture of fuel air and steam now passes through the nozzle 14 where it is ignited. The supply pipes are each provided with suitable control valves for the purpose of regulating the supply through the pipes.

Claims: 1. In a fuel burner, a pair of cylinders one within the other, an end plate closing one end of said cylinders, a pair of funnelshaped caps one inside the other closing the opposite end of said burner and forming a burner nozzle, the inner cylinder be- The second compart ing divided transversely into two compartments by a suitable partition having an aperture therein, means for admitting fuel extending through said end plate and terminating in one of said compartments, means for admitt'ng preheated air extenting through said end plate and terminating in the other of said compartments means for admitting steam into the space formed between said cylinders, and bathe plates having apertures therein in the first-mentioned compartment.

2. In a fuel burner, a pair of cylinders one Within the other an end plate closing one end of said oylinders, a pair of tunnelshaped caps one inside the other closing the opposite end of said burner and forming a burner nozzle, the inner cylinder being divided transversely into two compartments by a suitable partition having an aperture therein, means in one of said compartments for admitting fuel, said means extending through said compartment and terminating in the other of said compartments, means in the first of said compartments for admitting preheated air, means for admitting steam into the space formed between the said cylinders, baflle plates having apertures therein in the first-mentioned compartment for thoroughly mixing the fuel and preheated .air prior to entering into the nozzle and into contact With the steam. In testimony whereof I have signed my name to this specification.

JOHN WILLIAM BLACKBURN .BALFOUR. Witnesses C. NMPEARC'E, ,L. E. BOISE. 

